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Date & Time
Count the days between two dates, add or subtract time and convert between time units. Each tool explains how it treats calendars, months and leap years.
1–24 of 44 tools
Browse categories →Add Days to Date
Add Days To Date for practical everyday workflows. Enter the requested values to get a clear result.
Add Hours to Time
Add Hours To Time for practical everyday workflows. Enter the requested values to get a clear result.
Add Minutes to Time
Add Minutes To Time for practical everyday workflows. Enter the requested values to get a clear result.
Add Months to Date
Add Months To Date for practical everyday workflows. Enter the requested values to get a clear result.
Add Years to Date
Add Years To Date for practical everyday workflows. Enter the requested values to get a clear result.
Business Days Calculator
Count Monday-to-Friday weekdays between two dates. Public holidays are not automatically excluded.
Calendar Quarter Date Range
Calendar Quarter Date Range for practical everyday workflows. Enter the requested values to get a clear result.
Calendar Weeks Between Dates
Calendar Weeks Between Dates for practical everyday workflows. Enter the requested values to get a clear result.
Countdown Timer
Count the days, hours and minutes left until a date and time, such as a holiday, deadline or event.
Date Add or Subtract Calculator
Add or subtract a number of calendar days from a date.
Date Difference Calculator
Find the elapsed number of calendar days between two dates.
Date to Unix Milliseconds
Date To Unix Milliseconds for practical everyday workflows. Enter the requested values to get a clear result.
Date Weekday Or Weekend Checker
Date Weekday Or Weekend Checker for practical everyday workflows. Enter the requested values to get a clear result.
Day of Week Finder
Find the weekday for a calendar date.
Day of Year Calculator
Find the ordinal day number within a year.
Days Between Inclusive Calculator
Days Between Inclusive Calculator for practical everyday workflows. Enter the requested values to get a clear result.
Days in Month Calculator
Find the number of days in a month for a given year.
Days in Year Calculator
Days In Year Calculator for practical everyday workflows. Enter the requested values to get a clear result.
Fiscal Quarter Calculator
Fiscal Quarter Calculator for practical everyday workflows. Enter the requested values to get a clear result.
Fiscal Year Finder
Fiscal Year Finder for practical everyday workflows. Enter the requested values to get a clear result.
ISO Date to Unix Timestamp
Iso Date To Unix Timestamp for practical everyday workflows. Enter the requested values to get a clear result.
Leap Year Checker
Check whether a year is a Gregorian leap year.
Local Time to Utc Converter
Local Time To Utc Converter for practical everyday workflows. Enter the requested values to get a clear result.
Month Name from Number
Month Name From Number for practical everyday workflows. Enter the requested values to get a clear result.
About Date & Time
This collection has 44 ready-to-use tools for date & time. Every tool runs in your browser, so the numbers you type are not sent to a server. Each page explains what to enter, shows the formula or method behind the result, and gives worked examples you can compare against your own figures.
Results are estimates for planning and comparison. Where rates, thresholds or rules change from year to year, the tool page states the tax year or assumptions it uses. Check them against an official source before you file, pay or sign anything.
Popular here: Date Difference Calculator, Time Duration Calculator, Business Days Calculator, Date Add or Subtract Calculator, Unix Timestamp Converter, Time Zone Converter, Day of Week Finder, Day of Year Calculator.
Date & Time FAQ
Does the date difference include the end date?
The Date Difference Calculator counts elapsed days between two dates. Use the Days Between Inclusive Calculator when you need to count both the start and the end date.
How are leap years handled?
Calendar arithmetic uses real calendar dates, so leap days are counted automatically.
Does my time zone change the result?
Day counts use calendar dates without a time of day, so your time zone does not change them. The time zone tools convert clock times separately.